【摘要】 目的:研究国产微螺钉种植体支抗远中移动牙齿过程中的稳定性,观察种植体-骨界面的组织学特点。方法:4只成年beagle犬,拔除双侧上颌第一前磨牙,将国产微螺钉种植体MAS系统(长7 mm,直径1.4 mm)分别植入双侧上颌后牙根分歧或牙根间牙槽骨,每侧上颌3枚,植入后即刻以其中1枚种植体为支抗,另2枚为对照,对上颌尖牙施以0.98 N远中牵引力,牵引时间为3个月。共植入24枚种植体,其中8枚加载,另16枚为对照。加力结束后检查种植体松动度和位移变化,同时测量种植体-骨界面骨结合率。结果:8枚加载种植体均保持了稳固,在加载过程中发生了微小位移,平均位移0.74 mm;加载结束后发生部分种植体-骨结合,平均骨整合率为43.75%。结论:微螺钉种植体在受到持续负载的情况下达到良好稳固度,可以作为正畸支抗移动牙齿。更多还原

【Abstract】 Objective: To study the stability of microscrew anchorage implants in distal movement of the teeth in beagle dogs and observe the implant-bone interface histologically.Methods: Microscrew anchorage implants were implanted between the maxillary third premolar and bifurcation of first molar and mesial of the cuspids.After implantation,the cuspids were pulled by the implant and the strength is 0.98 N.Loading time was 3 months.After the experiment,histological analysis was made.Results: 21 of all the 24 implants were stable,only one implants loosened and another two implants were penetrated into maxillary sinus but were stable.The implants had displacements,0.74-0.81 mm in average.The osseointegration rate was 43.75%.Conclusion: Microscrew implant is a reliable anchorage mode in orthodontic treatment.更多还原